I'm 23 an I just became sexually active. Normally whenever I would get my period I would feel fine. After my first encounter with sex a week later I started feeling bad. I had cramps which I never get, only on the last day of my period. As time went on I got gassy, I have gained 6lbs, I have had terrible acne on my face and shoulders, sore breast and erect nipples, abdominal and pelvic pain (some nights easier than others). I thought it was just my body reacting to I don't know what lol, but it has been 4 months and I'm still having these symptoms, though the acne has subsided. When I lay down at night is when I feel the most pains and aches. I don't know what is going on because I know my body and it has never reacted like this. Might I add I am still getting my period which usually last 5 days but one month it was light and last only 2 1/2 days. I took several HPT's but they all came back never. I have no clue on to what's going on with my body but I need some help and answers.

It may be change in life style, stress, worry ? These are not really pregnancy signs, and since you are getting your period,that is not issue. Has there been diet or life style changes?

after 4 months, time to see doctor to see what issues this is